<template>
    <div>
        <!-- 顶部滑动条区域 tap方法解决手机端无法切换的问题，只有mui可用 -->
        <div id="slider" class="mui-slider">
            <div id="sliderSegmentedControl" class="mui-scroll-wrapper mui-slider-indicator mui-segmented-control mui-segmented-control-inverted">
                <div class="mui-scroll" >
                    <a :class="['mui-control-item', item.id == 0 ? 'mui-active':'']" 
                    href="#item1mobile" data-wid="tab-top-subpage-1.html" v-for="(item, index) in cates" :key="item.id" 
                    @tap="getPhotoListByCateId(item.id)">
                        {{item.title}}
                    </a>
                </div>
            </div>

        </div>
        <!-- 图片展示区域 -->
        <ul class="photo-list">
            <router-link v-for="item in list" :key="item.id" :to="'/home/photoinfo/' + item.id" tag="li">
                <img v-lazy.container="item.img_url">
                <div class="info">
                    <h1 class="info-title"> {{item.title}} </h1>
                    <div class="info-body"> {{item.zhaiyao}} </div>
                </div>
            </router-link>
        </ul>
    </div>
</template>

<script>
// 1.导入mui的js文件
import mui from '../../lib/mui/js/mui.min.js';
export default {
    data () {
        return {
            cates: [],
            list: [] // 图片列表的数组
        }
    },
    created () {
        this.getAllCategory();
        // 默认进入页面，就主动请求 所有图片列表的数据
        this.getPhotoListByCateId(0);
    },
    mounted() { 
        // 当组件中的dom结果呗渲染好并放到页面中后，会执行这个 钩子函数
        // 如果要操作元素了，最好在mounted 里面， 因为， 这个时候的DOM元素 是最新的
        // 2.初始化滑块的组件
        mui('.mui-scroll-wrapper').scroll({
            deceleration: 0.0005 //flick 减速系数，系数越大，滚动速度越慢，滚动距离越小，默认值0.0006
        }); 
    },
    methods: {
        getAllCategory () {
            this.$axios.get('/api/getimgcategory').then(result => {
                if (result.data.status === 0) {
                    // 手动拼接出一个最全的分类
                    result.data.message.unshift({title: "全部", id: 0});
                    this.cates = result.data.message
                }
            })
        },
        getPhotoListByCateId (cateId) {
            this.$axios.get('/api/getimages/' + cateId).then(result => {
                if (result.data.status === 0) {
                    this.list = result.data.message;
                }
            })
        }
    }
}
</script>

<style lang="scss" scoped>
* {
    touch-action: pan-x;
}
.photo-list {
    list-style: none;
    margin: 0;
    padding: 10px;
    padding-bottom: 0;
    li {
        background-color: #ccc;
        text-align: center;
        margin-bottom: 10px;
        box-shadow: 0 0 9px #999;
        position: relative;
        img {
            width: 100%;
            vertical-align: middle;
        }
        img[lazy=loading] {
            width: 40px;
            height: 300px;
            margin: auto;
        }
        .info {
            color: white;
            text-align: left;
            position: absolute;
            bottom: 0px;
            background-color: rgba(0,0,0,0.4);
            max-height: 84px;
            .info-title{
                font-size: 14px;
            }
            .info-body{
                font-size: 13px;
            }
        }
    }
}

</style>